[chore](test) Update excluded directories in regression-conf.groovy (#59115)

Added 'cold_heat_separation' and 'pipeline_p1' to the list of excluded
directories to save costs.

Author: hello-stephen

regression-test/pipeline/nonConcurrent/conf/regression-conf.groovy

@@ -66,6 +66,8 @@ excludeSuites = "000_the_start_sentinel_do_not_touch," + // keep this line as th
 
 // this directories will not be executed
 excludeDirectories = "000_the_start_sentinel_do_not_touch," + // keep this line as the first line
+    "cold_heat_separation," + // Save costs, the case is too time-consuming and not used by users
+    "pipeline_p1," + // Save costs
     "variant_github_events_nonConcurrent_p2," +
     "variant_github_events_new_p2," +
     "hdfs_vault_p2," +